Spring door lock



June 13, 1939. F. REAVILL SPRING DOOR LOCK Filed Aug. 1 1938 M 0 J A M K4 y MP/1 0 U m i DU. A m J m v a $7 m D KL. 1 y W a J y W/ .n v 6 HF m aM m E W F u 1. n flu l" 0 WVUM H m m m k Patented June 13, 1939 PATENTOFFICE SPRING DOOR LOCK Frederick Reavill, Beeston, England ApplicationAugust 1,

1938, Serial No. 222,504

In Great Britain May 8, 1937 4 Claims.

This invention relates to improvements in spring door locks of the kindin which a spring actuated plunger formed with a hemispherical end whichis projected through an opening in the look case, is adapted to engagein a hole in a catch plate, and its object is to provide improved meansfor locking this plunger in engagement with the catch plate, so that apositive lock is provided which can be controlled from a distant point.

The advantage of a lock of this description is that it can beconveniently applied in either of two positions that is, either on adoor or on the frame in which a door is disposed.

According to this invention, the main plunger is disposed in a casingsecured in the lock case together with an auxiliary plunger which is onthe inner side of and in the reverse position to the main plunger, and aspring is disposed be g tween the inner ends of these two plungers whichtends to project both, that is, the main plunger in an outer directionso that it will engage in the opening in the catch plate, and theauxiliary plunger in the reverse direction. Provision is g made forcontrolling the auxiliary plunger, and this consists of a slide which isdisposed in the lock case and is provided with a cam surface on whichthe inner end of the auxiliary plunger bears. This cam surface acts uponthe inner end 30. of the auxiliary plunger, and is of such a shape thatit moves the latter close up to and locks the main plunger in engagementwith the catch plate when the slide is moved longitudinally. The slidemay be fitted with springs which are 5- adapted to return it to itsnomal position when released.

The invention willnow be more particularly described with reference tothe accompanying drawing, in which Fig. 1 is a longitudinal section, and

Fig. 2 a cross section of a lock constructed according to my invention.

Fig. 3 is a front view partly in section showing the main plunger lockedin its projected position.

Fig. 4 shows diagrammatically how the slides of several locks may beconnected together and operated simultaneously.

Fig. 5 is a front View with the cover removed showing a modification.

Like letters indicate like parts throughout the drawing.

In carrying out this invention, the main plunger A which engages in thehole in the catch plate B, is disposed in a casing C secured in the lockcase D, and an auxiliary coaxial plunger E is disposed in the samecasing C on the inner side of and in the reverse positionto the mainplunger A. A spring F is disposed in the casing 0 between the plungers Aand E and this spring 5 tends to project both plungers, that is, themain one A in an outer direction so that it will engage in the openingof the catch plate B, and the auxiliary plunger E in an inner or reversedirection.

Disposed in the lock case D is a longitudinal slide G which is at rightangles to the plungers described, and the inner. end of the auxiliaryplunger E bears on a cam surface H on this, slide, which is so shapedthatwhen the slide G is 5 in its normal position as shown in Fig. l, theauxiliary plunger E can assume a position which leaves a space betweenits inner end, and that of the main plunger A, and the latter A is thenonly held in engagement with the catch plate 2 B by the action of thespring F.

When the slide G is moved longitudinally in either directions, theauxiliary plunger E is moved up to and holds the main plunger A in itsouter positionas shown in Fig. 3, any inward movement of A is thuseffectually prevented, so that the outer end of the plunger Aispositively locked in the catch plate B, and thedoor to which the lock isapplied is securely locked.

Both ends of the slide G described are fitted with longitudinalextensions or pins J which are carried through holes in the ends of thelock case D, and the ends of these extensions or pins J are formed sothat flexible but inextensible. connections K can be convenientlyattached to either one or the other, so that theslide G can be adjustedfrom a distant point in order to lock the main plunger A. If connectionsare made to both pins J, the slide can be adjusted from two points, orone of the connections can be taken to the slide G of another look ashereafter described.

The cam face H on the slide G, may be shaped so that it isreturned toits normal or non-locking position by the pressure put upon it by theinner end of the auxiliary plunger E, or if preferred, springs L may beinterposed as shown between its ends and the ends of the lock case D forthis purpose. These springs L may be disposed on the end extensions orpins J previously described, to which the external connections K can bemade.

Where a number of doors are required to be locked simultaneously, theextensions or pins J of the various slides G may be interconnected asshown in Fig. 4, and the doors can then be 2 V A. n

all looked simultaneously from a convenient control point.

The locking arrangement described is specially adapted for'lockingrailway carriage doors until 7 such times as a train comes to a stop, asthe slides G. in the locks employed in connection with each door andwhich locks would be fixed a slide G may be connected to an exteriorknob P,

so that it can be conveniently adjusted by hand, and as the slide G mustremain. in the position in .Which it'is set, springs are not required toreturn it'to: its normal position. The exterior knob P may be mounted onan axle M which extends to the exterior of the lock case-D and securedon the axle M is a toothed pinion O which engages with teeth on theslide G, so thatv adjustment of the slide can be effected by turning theknob 1?.

Alternatively a knob can be attached direct to the slide G and in thiscase the lock case D is formed with a slot, and the knob is secured onthe outer end of a stud on the slide which works 'intheslot. r V f Thelock can be attached either to a door or to the frame in which it isdisposed and it constitutes both a spring catch and a lock for securelyfastening a door.

What I claim as myinvention is: 1. In a spring door lock,the combinationof a main casing, an auxiliary casing disposed within said main casing,a pair, of catch members co-ax ially mounted in said auxiliary casing inreversed positions. for movement relative to one another,

7 '40 the outer endof one-of said catch members adapted'toextend outsideof the main casing for engaging a catch plate and the outer end ofthe'other of said catch members adapted to extend through the auxiliarycasing, a spring disposed in said;

4757 auxiliary casing between-theinner ends of said catch members fornormally maintaining the outer ends thereof projecting outwardly, and aslide mounted in said main casing and having a scam surfaceengageable-with the outer end of 507 the catch member which extendsthrough the auxiliary casing for moving the said catch mem-' berinwardly of the auxiliary casing to a position against the inner end ofthe other of said catch members for'locking the same in engagement Iwith the catch platei 2. In a spring door lock, the combination of amain casing, main and auxiliary catch members 7 permitting manipulationthereof.

having rounded outer ends, a subsidiary casing in which said catchmembers are located in reversed positions co-axial with each other, aspring disposed between the inner ends of saidcatch members forprojecting the rounded ends thereof out of the opposite ends of saidsubsidiary casing, the 7 outer end of the main catch member being adapted toextend outside'of the main casing for engaging a catch plate anda'slide-in said main casing having a cam surface adapted toact on theouter rounded end of said auxiliary'catch member for moving'the same upto said main catch member whereby to lock the main catch member inengagement With the catch plate.

3. In a spring door lock, the combination of a main casing, main andauxiliary catch members having rounded outer ends, a subsidiary casingin which said catch members'are located in reversed positions co-axialwith each other,a spring disposed between the inner ends of said catchmembers for projecting the rounded ends thereof out of the opposite endsof said subsidiary cas'-, ing, the outer end of the main catch memberbeing adapted to extend outside of the main casing for engaging a catchplate, a slide in said,

main casing having a cam surface adapted to act catch member whereby tolock the main catch member in engagement with the catch plate,extensions on said slide extending outwardly beyond the ends of saidmain casing whereby to peron the outer rounded end of said auxiliarycatch f member for moving the same up to said main mit connections to beconveniently made thereto, o and spring means for returning the slide toits normal position when released.

4. In a spring door lock, the combination of a main casing, main andauxiliary catch members 7 having rounded outer ends, a subsidiary casingin which said catch members are located in reversed positions co-axialwith each other, a

spring .disposed between the inne-rends of said catch members forprojecting: the rounded ends 7 thereof out of the opposite ends of saidsubsidiarycasing, the outer end of the main catch member on the outerrounded end of said auxiliary catch member for moving the same up tosaid main catch member whereby to lock the main catch member inengagement with the catch plate, a

toothed rack on said slide, and a pinion engaging said rack and disposedon an axle mounted in said main casing and having an exterior knob forFREDERICK REAVILL.

